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Speed regulation control of tractors’ new dual-flow transmission system based on slip rate resistance classification
Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering ( IF 1.7 ) Pub Date : 2021-04-21 , DOI: 10.1177/09544070211010574
Guang Xia 1, 2 , Yan Xia 1, 2 , Xiwen Tang 3 , Linfeng Zhao 2 , Baoqun Sun 1
Affiliation  

Fluctuations in operation resistance during the operating process lead to reduced efficiency in tractor production. To address this problem, the project team independently developed and designed a new type of hydraulic mechanical continuously variable transmission (HMCVT). Based on introducing the mechanical structure and transmission principle of the HMCVT system, the priority of slip rate control and vehicle speed control is determined by classifying the slip rate. In the process of vehicle speed control, the driving mode of HMCVT system suitable for the current resistance state is determined by classifying the operation resistance. The speed change rule under HMT and HST modes is formulated with the goal of the highest production efficiency, and the displacement ratio adjustment surfaces under HMT and HST modes are determined. A sliding mode control algorithm based on feedforward compensation is proposed to address the problem that the oil pressure fluctuation has influences on the adjustment accuracy of hydraulic pump displacement. The simulation results of Simulink show that this algorithm can not only accurately follow the expected signal changes, but has better tracking stability than traditional PID control algorithm. The HMCVT system and speed control strategy models were built, and simulation results show that the speed control strategy can restrict the slip rate of driving wheels within the allowable range when load or road conditions change. When the tractor speed is lower than the lower limit of the high-efficiency speed range, the speed change law formulated in this paper can improve the tractor speed faster than the traditional rule, and effectively ensure the production efficiency. The research results are of great significance for improving tractor’s adaptability to complex and changeable working environment and promoting agricultural production efficiency.



中文翻译:

基于滑移率阻力分类的拖拉机新型双流传动系统调速控制

在操作过程中操作阻力的波动导致拖拉机生产效率降低。为了解决这个问题,项目团队独立开发和设计了一种新型的液压机械无级变速器(HMCVT)。在介绍HMCVT系统的机械结构和传动原理的基础上,通过对滑移率进行分类来确定滑移率控制和车速控制的优先级。在车速控制过程中,通过对操作电阻进行分类,确定适合当前电阻状态的HMCVT系统的驱动方式。以最高的生产效率为目标,制定了HMT和HST模式下的变速规则,并确定了HMT和HST模式下的位移比调节面。针对油压波动影响液压泵排量调节精度的问题,提出了一种基于前馈补偿的滑模控制算法。Simulink的仿真结果表明,与传统的PID控制算法相比,该算法不仅可以准确地跟踪预期的信号变化,而且具有更好的跟踪稳定性。建立了HMCVT系统和速度控制策略模型,仿真结果表明,当负载或路况发生变化时,速度控制策略可以将驱动轮的滑移率限制在允许范围内。当拖拉机速度低于高效速度范围的下限时,本文制定的变速定律可以比传统规则更快地提高拖拉机速度,并有效地保证了生产效率。研究结果对提高拖拉机对复杂多变的工作环境的适应性,提高农业生产效率具有重要意义。

更新日期:2021-04-22
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